. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 53 Gynandromorphs Produced by XXY Females. No. N 2. December 12, 1912. C. B. Bridges. Plate 3, Figures 1 and la (colored drawings). Parentage.—The mother was an XXY female homozygous for wliite and heterozygous for the third-chromosome mutant pink. The father was red- eyed, and also heterozygous for pink. Both parents were exceptions produced by secondary non-disjunction. Description.—The fly was a completely bilateral gynandromorph, male on left side, fema
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 53 Gynandromorphs Produced by XXY Females. No. N 2. December 12, 1912. C. B. Bridges. Plate 3, Figures 1 and la (colored drawings). Parentage.—The mother was an XXY female homozygous for wliite and heterozygous for the third-chromosome mutant pink. The father was red- eyed, and also heterozygous for pink. Both parents were exceptions produced by secondary non-disjunction. Description.—The fly was a completely bilateral gynandromorph, male on left side, female on right. The male side was smaller, with sex-comb, the genitalia half and half. The fly was unable to breed as a male or as a. Text-figure 41. Text-figure 42. Text-figure 43. Text-figure 44. female. The abdomen was large and evidently contained a pair of ovaries The fly was figured in Heredity and Sex, page 163, and the origin given in Journ. Exp. Zool., 1913, page 597. Explanations.—A regular X egg carrying the gene for white was fertilized by an X sperm carrying the wild-type allelomorph red. One of the maternal X's, bearing the gene for white eye, was eliminated. The white-eye character therefore does not appear on either side. As both parents were heterozygous for pink, the fly may have come from third chromosomes bearing normal genes only, or one of them may have had the gene for pink, so that the g>'nan- dromorph is heterozygous. w No. N 3. November 30, 1912. C. B. Bridges. Plate 3, Figures 2 and 2a (colored drawings), (See fig. 17.) Parentage.—The mother was an XXY female, carrj'ing white in both X chromosomes. The father was a wild Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington; Morgan, Thomas Hunt, 1866-1945; Bridges, Calvin B. (Calvin Blackm
Size: 2053px × 1217px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectkaryoki, bookyear1919
